Changeboxes Marcus Denker Tudor Grba Adrian Lienhard Lukas - PowerPoint PPT Presentation

Encapsulating and Exploiting Change with Changeboxes Marcus Denker Tudor Gîrba Adrian Lienhard Lukas Renggli Oscar Nierstrasz Pascal Zumkehr

Marcus Denker Tudor Gîrba Adrian Lienhard Lukas Renggli Oscar Nierstrasz Pascal Zumkehr

Change happens.

“Depend in the direction of stability.”

A B A B C do foo do foo bar something ... something ... ... else anotherDo ... Add Change Remove Version i Version i+1

“Commit often.”

Update

Update Change

Update Change Commit

? Update Commit

We put the change in a box

1

Changeboxes encapsulate changes. 1 2 Change Specification

Changeboxes are immutable. 3 1 2 1 Change * ChangeBox Specification spec

4 3 1 2 1 Change * ChangeBox Specification spec

Changeboxes are applied on other Changeboxes. 4 3 5 1 2 1 Change * ChangeBox Specification spec * ancestor

Changeboxes are applied on other Changeboxes. 4 3 5 1 2 1 1 Change Merge * ChangeBox merger Specification spec Strategy * ancestor

Changeboxes define the scope for dynamic execution. 4 3 5 1 2 1 1 1 Change Merge * * Element ChangeBox merger Specification spec Strategy target * ancestor

1 1 1 Change Merge * * Element ChangeBox Specification merger Strategy target spec * ancestor Class Method Definition Rename ... Element Element Specification Specification

Method lookup is similar to Classboxes. B w ^4 B x B y B z A x B x B z ^1 ^2 ^3 ^10 A B

Method lookup is similar to Classboxes. B w ^4 B x B y B z A x B x B z ^1 ^2 ^3 ^10 MethodDict A x -> a MethodElement MethodDict B x -> a MethodElement y -> a MethodElement z -> a MethodElement w -> a MethodElement

Method lookup is similar to Classboxes. B w ^4 B x B y B z A x B x B z ^1 ^2 ^3 ^10 MethodDict A x -> a MethodElement B new x ? MethodDict B x -> a MethodElement y -> a MethodElement z -> a MethodElement w -> a MethodElement

Classes are looked up in a similar way.

Merge is supported via a MergeStrategy.

Changeboxes encapsulate changes. Changeboxes are immutable. Changeboxes are applied on other Changeboxes. Changeboxes define a scope for dynamic execution.

Encapsulate and exploit change in Changeboxes